Refrigerator



FIG. 1 is a top view of the refrigerator showing my new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a left top perspective view of the refrigerator showing my new design; and,

FIG. 6 is a top view thereof, shown in condition of use.

The broken lines shown in the drawing disclosure are for illustrative purposes only and form no part of the claimed design. 

I claim the ornamental design for a refrigerator, as shown and described. 